The integral indicators of the procurement activity of a network integrator in the organization of resource provision are considered and proposed. In order to further represent the general process of resource flow movement, an enlarged algorithmic model of resource provision in network organizational structures is proposed, which allows us to further build simulation models of individual stages. The purchasing process is presented as the basis for further movement of resource flows. In order to improve the quality of management decisions, a conceptual model of the procurement process of a network integrator is proposed. The presented algorithm of purchasing activity allows describing and mathematically formalizing the business processes of large organizational structures, such as the Russian Railways Holding.